Pigeon deterrents are methods used to keep pigeons away from specific areas, such as buildings, parks, and rooftops. Common deterrents include physical barriers like netting and spikes, which prevent pigeons from landing or nesting. Other options include visual deterrents, such as scare balloons or reflective surfaces, that create an unsettling environment for the birds. Additionally, some people use sound deterrents, like ultrasonic devices that emit high-frequency sounds unpleasant to pigeons but inaudible to humans. These methods aim to reduce the presence of pigeons without harming them, promoting a more peaceful coexistence in urban areas.